loose association of California photographers who promoted a style of sharply detailed, purist photography. The group, formed in 1932, constituted a revolt against the soft-focused, academic photography that was then prevalent among West Coast artists. The name of the group is taken from a setting of a camera diaphragm aperture that gives particularly good resolution and depth of field. The principal members of Group f.64 were Ansel Adams (Adams, Ansel), Imogen Cunningham (Cunningham, Imogen), Edward Weston (Weston, Edward), and Willard Van Dyke.

In 1932 the M.H. de Young Memorial Museum in San Francisco presented an exhibit of works by Group f.64, which aroused only mild public and critical interest. By 1935, however, when the group disbanded, its ideas had influenced the direction of photography.